Thread-cutter.



R G. BROWNELL.

THREAD CUTTER.

APPLICATION FILED OCT. 21. 1914.

Patented Mayl, 1916.

THE COLUMBIA PLANoulAPH 00-, WASHINGTON, D. C.

R. G. BROWNELL-1 THREAD CUTTER. APPLICATION FILED 001. 21. 1914.

" 1 1 16111611 May16,1916.

2 SHEETS-SHEET 2.

7 11-15 COLUMBIA PLANOGRAPH :0. WASHINGTON, D. L.

RAYMOND e. BBOWNELL, or CHICAGO, ILLINOIS.

THREAD-CUTTER.

Specification of Letters Patent.

Patented. May 16, 191

Application filed October 21, 1914. Serial No. 867,756.

To all whom it may concern:

Be it known that I, RAYMOND G. BROWN- nLL, a citizen of the UnitedStates, and a resident of the city of Chicago, county of Cook, and Stateof Illinois, have invented certain new and useful Improvements inThread-Cutters, of which the following is a specification.

My invention relates to improvements in thread cutters, and moreespecially tothread cutters adapted for use in threading pipes, theobject of the invention being to provide a simple, cheap, compact andeflicient construction for the purpose.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of partshereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings forming a part of this specification, and in which,

Figure 1 is a rear elevation of a construction embodying-my inventionshown in position for use, Fig. 2, a front elevation of the same withportions broken away and others shown in section, Fig. 3, a horizontalsection of the device, and Fig. 4, an enlarged detail view of a clampingvise employed in the construction.

The preferred form of construction as illustrated in the drawingscomprises a base plate 5 adapted to be secured to the top of a table orbench 5 adjacent the edge there of, said base plate being provided withupstanding posts 6, as indicated. The posts 6 are made of a size andshape to fit snugly within sockets 7 formed upon the rear of a circularplate. 8, said sockets being provided with set screws 9 for securingsaid plate to said posts, as will be readily understood. A casing 10 issecured to the outer face of plate 8 and is provided with a centralopening closed by a diametrically split plate 11. A hollow spindle 12 isrotatably mounted in plates 11 and 8, as shown in Fig. 3, said spindlebeing provided at one end with a die holder or box 13 adapted to receiveand hold an ordinary solid thread-cutting die and permit movement ofsaid die while cutting a thread. The outer end of holder or box 13 isclosed by a plate 1 1 having a central opening 15 therein for thepassage of the end of a pipe. Spindle 12 is formed with an octagonalcollar 16 and a large internal gear 17 inclosed in casing 10 and 17 and19, but of a size to mesh only withone.

Gear 20 is secured to the end of a shaft 21 eccentrically mounted in aneccentric 22 and provided with a crank handle 23'for rotating the same.Eccentric 22 is provided with an adjusting arm 2 1 by means of whichsaid eccentric may be rotated in its bearing in casing 10. Thearrangement is such, that by shifting eccentric 22, gear 20 may beshifted laterally to mesh with either of the gears 17 or 19, as desired,thus permitting of the rotation of spindle 12 at a slow or at acomparatively high speed.

Ribs or strips 25 are formed upon the rear face of plate 8 and aclamping block 26 is adjustably .arranged between said ribs, said blockbeing provided witha clamping jaw- 27 adapted to contact with the underside of a pipe or similar article extending through spindle 12. Theblock 26 is secured in adjusted positions by means of screws 28 adaptedto engage threaded semicylindricalnotches 29, 30, 31, 32 and 33 formedin the corresponding edges of said block and ribs 25 when inregistration with each other. Each cooperating pair of notches is of asize and thread to receive one of the screws 28 when brought inregistration with each other, and the notches are so spaced as to permitof adjustments of block 26 to receive the usual standard sizes of pipes,as will be readily understood. A vise jaw 34: is slidable in a guide 35formed on the rear of plate 8 and has its upper end swiveled to the endof an adjusting screw 36 threaded in a lug 37 also formed on the rear ofplate 8. Screw 36 is provided with an operating handle 38 by means ofWhich pipes positioned centrally in spindle 12 may be tightly clampedand held in such position. The arrangement is such, that the clampingblock 26 may be readily adjusted for different sizes of pipes anddifferent sizes of pipes inserted in die holder 13, the clamps 37 and 34serving to position the pipes accurately with respect to the die, thusdispensing with the necessity of guides. When cutting the thread, gear20 is shifted into mesh with the internal gear 27 thus obtaining a slowspeed and large leverage for the cutting operation. When the actualcutting is finished, gear 20 is shifted into mesh with gear 19 so thatthe die may be run off of the pipe rapidly. Likewise when it is onlydesired to clean out a thread, the gear 19 may be used and thus a highspeed 0btained.

The construction is simple, compact, efficient and may be manufacturedvery economically.

WhileI have illustrated and described the preferred form of constructionfor carrying my invention into efiect, this is capable of variation andmodification without departing from the spirit of the invention. I,therefore, do not wish to be limited to the precise details ofconstruction set forth, but desire to avail myself of such variationsand modifications as come within the scope of the appended claims.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

1. A thread cutter comprising a casing adapted to be detachably securedto a table; a rotatable hollow spindle extending centrally through saidcasing; a die holder at one end of said spindle; an adjustable viseformed at the other end of said spindle; a large internal gear in saidcasing and attached to said spindle; a spur gear in said casing attachedto said spindle; an eccentric mounted in the wall of said casing between said spur and said internal gears; a shaft rotatably mounted insaid eccentric; a gear on said shaft adapted to mesh with either saidinternal gear or said spur gear; a crank handle for operating saidshaft;

copies of this patent may be obtained for live cent: each, by addressingthe and an arm for operating said eccentric, substantially as described.

2. The combination with a rotatable die holder of an adjustable visecooperating therewith, said vise comprising a slidable block providedwith a clamping jaw, the edges of said block and the guard thereforbeing provided with registrable notches for securing them in adjustedrelations, substantially as described.

3. The combination with arotatable die holder of an adjustable visecooperating therewith, said vise comprising a slidable block providedwith a clamping jaw, the edges of said block and the guard thereforbeing provided with registrable semi-cylindrical threaded notches forsecuring them in adjusted relations; and screws threaded in saidnotches, substantially as described.

4. A thread cutter comprising a casing; a rotatable hollow spindleextending through said casing; a die holder at one end of said spindle;a vise at the other end of said spindle; a large internal gear in saidcasing and attached to said spindle; a spur gear in said casing attachedto said spindle; a driving gear in said casing between said firstmentioned gears; means for shifting said driving gear into and out ofengagement with said first mentioned gear; and means for driving saiddriving gear, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

RAYMOND G. BROWVN ELL.

Witnesses:

JOSHUA R. H. POTTS, JANET E. FARRELL.

Commissioner of Patents,

Washington, D. G.

